Add webhook notification and API logic

src/Ombi.Api.Webhook/IWebhookApi.cs

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+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Ombi.Api.Webhook
+{
+    public interface IWebhookApi
+    {
+        Task PushAsync(string endpoint, string accessToken, IReadOnlyDictionary<string, string> parameters);
+    }
+}

src/Ombi.Api.Webhook/Ombi.Api.Webhook.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <AssemblyVersion>3.0.0.0</AssemblyVersion>
+    <FileVersion>3.0.0.0</FileVersion>
+    <Version></Version>
+    <PackageVersion></PackageVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Ombi.Api\Ombi.Api.csproj" />
+  </ItemGroup>
+
+</Project>

src/Ombi.Api.Webhook/WebhookApi.cs

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+using Newtonsoft.Json.Serialization;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace Ombi.Api.Webhook
+{
+    public class WebhookApi : IWebhookApi
+    {
+        private static readonly CamelCasePropertyNamesContractResolver _nameResolver = new CamelCasePropertyNamesContractResolver();
+
+        public WebhookApi(IApi api)
+        {
+            _api = api;
+        }
+
+        private readonly IApi _api;
+
+        public async Task PushAsync(string baseUrl, string accessToken, IReadOnlyDictionary<string, string> parameters)
+        {
+            var request = new Request("/", baseUrl, HttpMethod.Post);
+            request.AddHeader("Access-Token", accessToken);
+            request.ApplicationJsonContentType();
+
+            var body = parameters.ToDictionary(
+                x => _nameResolver.GetResolvedPropertyName(x.Key),
+                x => x.Value
+            );
+
+            request.AddJsonBody(body);
+
+            await _api.Request(request);
+        }
+    }
+}